Low Flows of Varying Fluid Viscosities

FlowMeters.com”sMAC Series electromagnetic flowmeters are designed for reliability inmeasuring very low flows of electrically conductive chemicals andfluids of varying viscosities. The flowmeters are small, plastic-bodiedinstruments capable of measuring pulsating flows from air andsolenoid-driven metering pumps. The “minimag” meters are offeredin three sizes that accommodate nominal maximum flowrates from one toeight gallons per minute. The meters transmit a continuous flow signal,measure and display both flowrate and total flow, and provide a varietyof outputs including relay alarm outputs. The flowmeter sizes and theirnominal full-scale flowrates are: 1/4″, one gallon per minute (3.8liters per minute); 3/8″, three GPM (11 LPM); and 1/2″, eight GPM (30LPM). Low-flow cutoffs for each size are: 1/4″, .009 GPM (.04 LPM);3/8″, .025 GPM (0.1 LPM); and 1/2″, .065 GPM (.25 LPM). The meters havea four to 20 mA, zero to five volt flow signal and a frequency signal(up to 9,999 pulses per gallon) proportional to flow. The metersalso have relay alarm outputs that signal if flow goes above or belowuser-set flow levels. Flowrate is displayed in user-selected timeand volume units (for example, liters per minute). Total flow isdisplayed in the chosen units up to eight digits. Flow measurementaccuracy is +/- 1 percent of reading above 10 percent of full scale,+/- 3 percent below 10 percent of full scale. They tolerate fluidtemperatures up to 185 F and pressures up to 150 PSI at 75 F. Wettedmaterials include a body of Kynar PVDF, electrodes of platinum orHastelloy corrosion-resistant alloy, and internal seals of Vitonfluoroelastomer. Housings are of fusion-coated aluminum withpolycarbonate control/display units.